2027. In that case, the Storage Engine creates a new, empty page and moves 50 % of the rows (usually, but not always) from the full page to the new page. Automatic index and statistics management. The method (not a trick), therefore, is to Create Clustered Index only for the purpose of de-fragmenting the Heap, and drop it afterward. Weekly – 3% fragmented. When partitioning a nonunique clustered index, and the partitioning column is not explicitly specified in the clustering key, SQL Server adds the partitioning column by default to the list of clustered index keys. Find and remove unused indexes – everything that is unused doesn’t do anything good. index_id as [SI. Why do you think defragging is an operation eligible for minimal logging? I don. lang. I teach the MS 2073 class quite a bit and the course material just. Manually shrinking or growing files using T-SQL commands can also contribute to physical file fragmentation. This is called fragmentation. The defragmentation of a heavily fragmented index can generate more log than a fully logged index creation. There are several options that allow you to specify the level of. If the DB has. However I want advice whether it is required to setup the SQL Server Index and Statistics Maintenance scripts, because my SQL server is running on a SAN. Detach the database. SQL Server index. Microsoft recommends Index Rebuild operation to defrag indexes if the fragmentation level of your index is greater. For maintenance purposes, you can use Azure Automation and create a recurring script that checks for fragmented indexes and optimizes it. Requires ALTER permission on the table or view. Often, this is not enough to perform index. Receive email notifications for policy and. From what we can tell, SQL Server does not conduct any internal maintenance on the system base tables, meaning that they can become very fragmented over time and bloated in size. Then we can use contig [Filename] as shown below to defragment. However, the index maintenance defaults. Index Defragmentation is one of the key processes to significantly improve performance of any database. So it can remove some fragmentation - but only on a limited scale. To create a linked server to azure, you can see this SO link:I need to add a linked server to a MS Azure SQL ServerSQL SERVER – Fragmentation – Detect Fragmentation and Eliminate Fragmentation SQL SERVER – 2005 – Display Fragmentation Information of Data and Indexes of Database Table SQL SERVER – De-fragmentation of Database at Operating System to Improve Performance. It’s advisable to remove those often. Hello Marcos, I can't confirm this. He makes the point that, by analyzing indexes effectively, you can save a lot of. name AS IndexName, qs. [object_id] = [idx]. The other interesting thing here is that the size of the fragmented index is now 347% larger than in SQL Server Standard. Contig can defragment SQL Server database and log files while the databases are online, but there is some performance cost (whether or not the. SELECT OBJECT_SCHEMA_NAME(ips. Index Defragmentation is one of the key processes to significantly improve performance of any database. It is probably better to use the first parameter of sys. The Ultimate Index Width Stats Reporter. Coworker started REBUILD on both tables. Delete the database with fragmented MDF file. Locking. Here's one from MSDN:--This example shows a simple way to defragment all indexes in a database that is fragmented above a declared threshold. Maintenance. dm_os_performance_counters where counter_name = 'page splits/sec'. Here are the MS guidelines. If running into a particular performance issue, Microsoft PSS will sometimes recommend a manual full reindex. The. It’s like a looking at the results of a developer writing SQL after three Red Bulls – it doesn’t make any sense, and you just want to wad it up and throw it away. This database has a few hundred tables and each table has a range of 1 to 15 indexes per table. Check indexes from the index grid and click desired defragment operation from the ribbon. Create a clustered index and move it away from the heap. One or more of the databases used by SharePoint Server have fragmented indexes. 16. indexes. HSQLDB version 1. Watch this video by @A_Bansal to understand index fragmentation & page splits. If you have a clustered index on the table the fastest way to defragmanet your table would be to drop and recreate the clustered index. To enable the Database Rebuild Index, we could go through this path: Site > Site Maintenance > Edit the Maintenance task. Use the Rebuild Index Task dialog to re-create the indexes on the tables in the database with a new fill factor. Extra disk space required during SQL Server online index rebuilds. After running your script in SQL 2005 I still don’t see any index defrag changes not with a 3-rd party monitoring tool or by running this: USE master SELECT * FROM. Index fragments occur when any transaction takes place in database table. OBJECT_ID) + '] REBUILD; ' END, 'GO' FROM sys. February 6, 2019. Azure SQL Database is a PaaS solution for migrating your on-premises databases to the Azure cloud infrastructure. The SYS. SQL Defrag Manager is a powerful solution that automates and optimizes your SQL Server database defragmentation. Fortunately, like Windows 7, Server 2008 can on a schedule defrag. Using SQL Server Managed Lock Priority for Online Index Rebuilds. SELECT OBJECT_NAME (fq. One solution is to deploy a faster I/O subsystem, where page splits would be less of an issue. Both are deprecated in favour of ALTER INDEX where. Defragmentation utilities may lock sections of the file, preventing SQL Server from completing a read or write operation. You can't do online index rebuilds. On version 2019 it runs for over 30 minutes. This. Missed Connection: Employer Seeking Employee. Here are some steps you can follow to free up some space in a hurry. It makes your indexes larger and many operations slower by making the SQL Server access more pages than necessary. Defragment on-demand and via schedules. #1637994. To create a linked server to azure, you can see this SO link:I need to add a linked server to a MS Azure SQL Server SQL SERVER – Fragmentation – Detect Fragmentation and Eliminate Fragmentation SQL SERVER – 2005 – Display Fragmentation Information of Data and Indexes of Database Table SQL SERVER – De-fragmentation of Database at Operating System to Improve Performance. go. [name] , ips. The method (not a trick), therefore, is to Create Clustered Index only for the purpose of de-fragmenting the Heap, and drop it afterward. Lines 469-480 set up the dynamic SQL to rebuild the specified index for. Less bad with modern disk subsystems (which is why we focus less on defrag nowadays). Improve this answer. SELECT OBJECT_NAME (fq. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Azure Synapse Analytics Analytics Platform System (PDW) Columnstore indexes are the standard for storing and querying large data warehousing fact tables. dm_db_index_physical_stats(DB_ID(N'XXXMYDATABASEXXX'),. physical defragmentation by orders of magnitude. The DBCC SHOWCONTIG statement traverses the page chain at the leaf level of the specified index when index_id is specified. The reason why too many page splits can decrease the performance of SQL Server is because of the large number of I/O operations. For more information, see ALTER DATABASE (Transact-SQL). Our Production instance is running SQL Server 2014. This reversed the defragmentation step and gave them a database with nearly 100% fragmentation. MyTable REBUILD. Note that PostgreSQL uses the term "clustered index" to use something vaguely similar and yet very different to SQL Server. SQL Defrag Manager improves server performance by detecting fragmentation hot spots and automatically defragmenting them. Because the smallest unit of data to be cached is an 8 kB data page, not a single row, it also. To create a new maintenance plan, right click on Maintenance Plan and select New Maintenance Plan and the following window will open. Use the ALTER TABLE command to rebuild the Heap. Expand the Indexes. This tool provides index analysis to manage index defragmentation, including rebuild and reorganize fragmented indexes . This can be demonstrated by small test. The results for this command are up for comparison against the Alter Index Rebuild. Index fragmentation can cause high CPU usage, which means disk usage, and therefore performance degradation. After the defragmentation, the following is the fragmentation report of our db. Now SQL have 4 threads to the database and not one. Set log file to start at 1 GB. The other thing you can do, for when you do need to defragment indexes (if for example you have deleted a large amount of data), is using SQL Server's Service Broker to set up the maintenance plan for multiple tables in a batch. In this type of index, a pointer to the actual table data is stored in the leaf node. It is compatible with all versions of SQL Server 2005 , 2008 , 2012 , 2014 and 2016. [name] as 'Table', dbindexes. For an Azure SQL Data Warehouse table with an ordered clustered columnstore index, ALTER INDEX REBUILD will re-sort the data. I would run it every night, personally, as a general rule. Select Steps, and then select New to add an execution step. DBCC SHRINKDATABASE(WorldOfHurt, 1); And it’ll reorganize the pages in the WorldOfHurt to leave just 1% free space. I have been trying to defrag indexes in SQL Server 2005 and nothing seems to work. ApexSQL Defrag can be easily used to connect to your SQL Server instance and analyze the index fragmentation percentage at the instance, database, or table levels. If you don't want to grant so granular. You have the option LOB_COMPACTION. From what we can tell, SQL Server does not conduct any internal maintenance on the system base tables, meaning that they can become very fragmented over time and bloated in size. how to find out defragment index pages in sql server 2008 using script? 0. To reduce tempdb contention, divide the database file into multiple files of equal size. We can see after the command there are only 4 fragments. That article is in-depth and difficult to summarise in this reply, but it comes down to creating an asynchronous. It can be done with online option in enterprise edition. Index rebuild is a heavy-duty process where index is deleted and then recreated from scratch with entirely new structure, free from all piled up fragments and empty-space pages. There's a general consensus that you should reorganize ("defragment") your indices as soon as index fragmentation reaches more than 5 (sometimes 10%), and you should rebuild them completely when it goes beyond 30% (at least that's the numbers I've heard advocated in a lot of places). page_count FROM sys. ; usp_AdaptiveIndexDefrag_PurgeLogs, which will purge the log tables of data older than 90 days, to avoid indefinite growth. This setting is known as the fill factor. We have a SQL 2016 database that has a 1. Note that the time limit is checked BEFORE an index defrag begins, thus a long index defrag can exceed the time limit. 1. Let us create a Heap Table and insert some records in it and then check the fragmentation. List the Indexes. This is because the doc set was reorganized for the SQL Server 2012 release, and not all topics/categories made it. I took a look at its log and it looks like it hadn't even finished with the indices from the first table by the time I cancelled the job: Job '02. Index automation Job script. Heaps will show up in your contig reports, and you can see the fragmentation percentage along with the other index frag stats. It is very common to see big increase in performance after optimizing your SQL indexes. MDF is contiguous on disk. For more information, see sys. For example, you can use ApexSQL Defrag to review the index usage statistics and apply the suitable. is_ms_shipped = 0 --Excludes any objects created as a part of SQL Server installation AND ss. 2. fulltext_index_fragments to query for the number of queryable fragments (status = 4 or 6) in the full-text index, as follows: SELECT table_id,. The general consensus is if fragmentation is: Less than 10% – there is no need to do anything to the index. SQL Server 2005 and later provides a dynamic management function (DMF) to determine index fragmentation level. Leverage solutions such as Adaptive Index Defrag to automatically manage index defragmentation and statistics updates for one or more databases. dm_db_index_physical_stats(DB_ID(N'XXXMYDATABASEXXX'), OBJECT_ID(N'XXXMYTABLEXXX'), NULL, NULL, NULL) AS [ips] INNER JOIN sys. Apart from disk space you should not be too worried. Rebuild does not drop and recreate the clustered index. I'd consider doing a LOB_COMPACTION less frequently but both options comes down to your maintenance windows duration pretty much. Greater than 30% – rebuilding the index with the REBUILD option is probably the best option. dm_db_index_physical_stats in SQL Server 2005 and later. If it does not, the table is considered a HEAP. Review SQL Server script to rebuild all indexes for all tables and all databases tip. Daily – 6% fragmented. In a nutshell, SQL Server’s performance can be most improved by focusing on its internals. or. DBCC IndexDefrag – 1015984 ms (1,016 secs or just under 17 minutes to complete) Alter Index ReOrganize – 345512 ms (346 secs or just under 6 minutes to complete) DBCC DBReIndex just like mentioned at the start of this blog is being deprecated. Maintenance. There are two main ways to defragment a Heap Table: Create a Clustered Index and then drop it. Reorganizing only works on the leaf pages. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. The SQL Server Index and Statistics Maintenance part of Ola Hallengren’s solution consists of IndexOptmize stored procedure and IndexOptimize – USER_DATABASES agent job, that are created during the installation process. dm_db_index_physical_stats ‘ Dynamic Management View (DMV). Fragmented indexes will primarily slow down ‘search’ performance. Speaking for SQL Server, I tend to choose a index size and index fragmentation level at which point I begin performing index maintenance. 2 Answers. Ignore: Fragmentation levels of 10 percent or less should not pose a performance problem, so you don’t need to do anything. Thanks for the info on Showcontig and Index Defragmentation. Next the New Job window will open. You can use SQL Server Management Studio (SSMS) or T-SQL to get started managing index fragmentation. I do not understand the distinct, group by or sum(row_count) clauses. Location : HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Search. This means you can grant alter table on every table of interest that already exists. Maintenance. @dbScope specifies a database name to defrag. To optimize read-only workloads on the readable secondary replicas, you may want to create indexes on the tables in the secondary databases. Reorganizing an index defragments the leaf level of an index by physically re-ordering pages to match the logical order. In SQL Server, when rebuilding an index which previously had statistics updated with PERSIST_SAMPLE_PERCENT, the persisted sample percent is reset back to default. Between 10% and 30% – defragging the index with the REORGANIZE option is recommended. The procedure CommandExecute also has to be installed in order to use the index optimize. Refer to the below links:The downside to using the Reorganize Index task is that its index defragmentation capability is not as thorough and complete as the Rebuild Index task. if the index has: less than 5% logical fragmentation, don’t do anything. It's a. Run sys. SQL Server 2008 index fragmentation problem. Index defragmentation is a part of Microsoft SQL Server maintenance where the index of database engine indexes of insert, update and delete operations is optimized to reduce fragmentation. You also can create a linked server to SQLAZURE and create a sql agent job. If you are experiencing slow full-text query performance, you can use sys. The execute sql task should contain the index rebuild code along with stats rebuild . If you have space constraint on the Server then you may need to Shrink the db. Defragment indexes on your SQL SCCM database every night. 2005, but if you read around the 'net you'll find many more references to choose to rebuild your indexes via the ALTER INDEX command, which is new for SQL Server 2005. So, how to identify the fragmentation of all indexes in a database? Here is the query. Databases with no index defragmentation were an average of 5% fragmented. You can use SQL Server Management Studio (SSMS) or T-SQL to get started managing index fragmentation. Database Engine Tuning Advisor is a client application provided by Microsoft that analyzes database workload and recommends an optimal set of indexes for your Microsoft SQL Server databases based on the kinds of queries you run. Time time went down, physical reads went way down and read-ahead reads went way up. That article was where the old "Best Method" recommendation of Reorg between 5 and 30% and Rebuild at > 30% fragmentation used to live. From this tab, select a SQL Server instance in the server explorer on the left and choose database (s) as a target of index operation. It is designed specifically to overcome the compromises DBAs have to make regarding the important task of index fragmentation maintenance. – Dave Mason. For this example, the defragmentation reduces the size of the index by more than 3x (from 25 pages to 7 pages) and the table consumes just over 50% less space. dm_db_index. In this article. avg_fragmentation_in_percent. avg_fragmentation_in_percent. Until yesterday, we always limited the WHERE-clause: where date > '20180101'. alter index ci on t_ci reorganize -- measure the fragementation select avg_fragmentation_in_percent, avg_fragment_size_in_pages, fragment_count, avg_page_space_used_in_percentAWS Improving database optimization doc article provides information about Rebuild Indexes and Update Statistics. In our previous blog post, we got to know, how to find out all fragmented indexes in a database. Instead of our phone book having 1,000 pages that are 100% full, we might have 1100 pages that are only 90% full. In this blog post, I’m going to discuss index fragmentation, several ways you can identify it, and why a more granular approach. It is a managed service and Azure manages the infrastructure, database availability, backup restore, and compute resources. Now SQL have 4 threads to the database and not one. If it grows often, it could concievably become fragmented. dm_db_index_physical_stats in SQL Server 2005 and later. If you truly want to REBUILD, and you want to do it for ALL indexes on a given table, then the command would be (straight from the official docs that npe pointed you at): For more instructions see the official docs. (Look in the Misconceptions blog category for the rest of the month’s posts and check out the 60-page PDF with all the myths and misconceptions blog posts collected together when you join our Insider list, plus my online Myths and Misconceptions. The only way to get rid of this fragmentation is to rebuild both the non-clustered index and the clustered index. Your best assistant here is our SQL Defrag feature, seamlessly integrated with dbForge Studio for SQL Server . (Look in the Misconceptions blog category for the rest of the month’s posts and check out the 60-page PDF with all the myths and misconceptions blog posts collected together when you join our Insider list, plus my online Myths and. 4 Answers. SELECT CASE WHEN indexstats. 1. It is designed specifically to overcome the compromises DBAs have to make regarding the important task of index fragmentation maintenance. There's a Runbook in the Gallery just for that:Hi any body help to tell me how to create a Procedure to defrag index on a daily basis in MS SQL Server 2000. Paul Randal. From the SQL Server Index Properties page, browse the Fragmentation page, and you will see the index fragmentation percentage and how much the SQL Server index pages are full. {"payload":{"allShortcutsEnabled":false,"fileTree":{"AdaptiveIndexDefrag":{"items":[{"name":"CHANGELOG. Defaults to 480m (8h). ) Then rerun the above free-space query again to see how the shrink worked: Free space after. Custom SQL Server Index Defrag and Rebuild Procedures. Follow. Fragmentation. December 16, 2013 10:03 am. 11:33. Reorganizing the indexes: ALTER INDEX ALL ON dbo. The length of time the rebuild takes is related to the size of the index, not the amount of fragmentation in it. I know that there are really three kinds of fragmentation that I need to be concerned about as a DBA: Index Fragmentation in the SQL data files, including clustered index (table) fragmentation. Daily – 6% fragmented. Here are the changes: Added support for database and object names with special characters. dm_db_index_physical_stats to get information about your index fragmentation (see the avg_fragmentation_in_percent column). This had a negligible impact. Automate defragmentation policies to multiple databases, tables, and indexes. SQL index fragmentation reports. Review Index Fragmentation Report in SQL Server 2005 and 2008 tip. 25. The datafile is also showing as 220gb but the actual space used is 140gb. If your table has a clustered index, the state of the index reflects the state of the table. I have created multiple. This article shows an example of how to manually perform defragmentation on an index using SQL Management Studio. Maintenance. When we were listing the fragmanted indexes our scope was on the indexes that are used in expensive SQL Statements. August 1, 2013 at 3:52 pm. HeapTest ( Id INT not NULL Default (1), Col1 char (5000) Not null Default ('Heaps Are Cool') ) SET NOCOUNT ON Insert into dbo. The data of partitioned tables and indexes is divided into units that may be spread across more than one filegroup in a database or stored in a. Miscellaneous tasks such as enabling trace flags or removing a DLL. To rebuild or reorganize indexes manually, head over to the Fragmentation tab. 1. Normal Windows defrag cannot defrag open files. Use DBCC INDEXDEFRAG to defragment an index. Having said that, fragmented data can produce unnecessary reads thereby reducing. I want to defrag tables in sql server, I used this code to know the fragmented indexes: sELECT dbschemas. It has been proven that Online Index Rebuild – Can Cause Increased Fragmentation when it is allowed to run with MAX DOP > 1 and ALLOW_PAGE_LOCKS = OFF directives. The wise use of indexes is a proven method of improving database performance. Defragment Indexes. 0. SQL Server 2000 introduces a new DBCC INDEXDEFRAG statement to defragment clustered and nonclustered indexes on tables and views. In older versions of SQL Sentry, this feature is disabled by default. Online vs offline SQL Server index rebuild in SQL Server. 0 supports the SQL statements and syntax described in this chapter. The execute sql task should contain the index rebuild code along with stats rebuild . There needs to be an automated Index defragmentation job that will either reorganize or rebuild the indexes based on the fragmentation level for a specific table in a specific database. I have a weekly process that does all of my database checks, etc. avg_fragmentation_in_percent, ips. Scott Dexter, 2008-08-05 (first published: 2008-06-12) The following is a script that I have worked off and on with until I finally decided that I had worked on it. 1. Usage involves setting the following five parameters (technically, variables) at the top of the script: @DATABASE_NAME: set to whatever database you want to check for fragmented indexes. 0. dm_db_index_physical_stats DMF to. This may affect the concurrency of the server that's running SQL Server. Sorted by: 2. Let the internal health rule which takes care of index fragmentation run. DBCC INDEXDEFRAG (AdventureWorks2022, 'Production. When I got the stats from dm_db_index_physical_stats , there were still 27 records which needed defrag and all of theses were NON CLUSTERED Indexes. [index_id] The name of the index. Databases with no index defragmentation were an average of 5% fragmented. /*Perform a 'USE <database name>' to select the database in which to run the script. Reorganize: Reorganize indexes with between 11-30 percent fragmentation. On smaller databases it ran quite quickly and with the correct and desired effects. Use DBCC INDEXDEFRAG to defragment an index. As well as maintenance plans, SQL Server Agent jobs are also a handy way to automate and schedule index defragmentation jobs in SQL Server. USE [TestFileShrink] GO DBCC SHRINKFILE (N'TestFileShrink_data', 3000) GO. Otherwise, nothing special. Reference: Pinal Dave (had some indexes on a table with around 700m rows that I couldn't defragment below around 30%. In the Rebuild Indexes dialog box, verify that the correct index is in the Indexes to be rebuilt grid and click OK. Leverage solutions such as Adaptive Index Defrag to automatically manage index defragmentation and statistics updates for one or more databases. There are three options to remove fragmentation in heaps: Create a clustered index and drop it once it is completed. Microsoft Certified Master: SQL Server, MVP, M. If you are using SQL Server 2008 or below, you can use the DBCC INDEXDEFRAG statement (this statement will be removed in SQL Server Kilimanjaro). If avg_fragmentation_in_percent value is > 5% and < = 30% then you should Reorganize Index. A SQL Server DBA myth a day: (29/30) fixing heap fragmentation. Failing that (ie Standard Edition etc), look at re-organizing indexes - these will keep them online. Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance SQL Server, Azure SQL Database, and Azure SQL Managed Instance support table and index partitioning. Index fragmentation at a filesystem level really only hurts two things, the first of those is read. If not specified, all non-system databases plus msdb and model will be defragmented. You can also change this threshold via parameters. This statement defragments the leaf level of the index so that the physical order of the index pages match the left-to-right logical order of the leaf nodes. Fortunately, like Windows 7, Server 2008 can on a schedule defrag. Right-click on the fragmented index and select Rebuild or Reorganize option in the context menu (depending on the desired action): Click the OK button and wait for the process to complete. This is done by reorganizing or rebuilding an index on an entire index or a single partition. I figured, the reason was because of the page_count, which was lower than 1000 for each of the indexes that were still very fragmented. @tblName specifies if you only want to defrag indexes for a. However, each records will be updated at least 3 times afterwards. 8. In this article, I will provide a mechanism for automating SQL Server index defragmentation implemented in a database used in the company I work for. The re-inserting of the data in PK order assures that the data is well-defragmented. Fragmentation can be defined as any condition that cause more than optimal amount of disk I/O to be performed in accessing a table or cause the longer disk I/O. This can be checked using:. If you have fragmentation, you need to REBUILD or REORGANIZE. Greater than 30% – rebuilding the index with the REBUILD option is probably the best option. Create a clustered index and move it away from the heap. Delete the other 7 files. Database size was ~66GB. There are two main ways to defragment a Heap Table: Create a Clustered Index and then drop it. According to. In this Article, I am sharing T-SQL Script to find the Index Fragmentation report for SQL Server User database. Coworker started REBUILD on both tables. When you purge the table, you need to rebuild the index(s) on the table which will defrag the table data. It creates a thread that runs periodically to detect when the database has more than 25% free disk space allocated to it. [avg_fragmentation_in_percent] FROM sys. Compression enabled on both. A. So if I understand, with the fragmented indexes, SQL Server must go all around the Disk to find the pages it needs. Larger indexes have more intermediate levels and pages. To work around a very large index that won't defragment, the BEST solution is to pre-size a new database and move all your objects to that DB. Perform logical consistency checks on indexes. SQL Server will be asking for much more data form the data (SSD) pages to satisfy the queries need to read through indexes root levels and intermediate levels to get to the data. This may affect the concurrency of the server that's running SQL Server. We have several databases in which a large number of tables are created and dropped. Example: Name: Indexrebuild_job; Description: RDS for SQL server agent job for index rebuild. They’re better than yours (trust me), and they give you more flexibility than built-in maintenance plans. 1 Answer. Next Steps This is a simple base script that could be modified into a stored procedure and also allow you to pass other parameters such as doing an index. SQL Server Index Defragmentation. Optimal. You have the options in the Plan for shrinking the database and defragging existing indexes. Features: Supports Microsoft SQL Server 2005, 2008, 2008R2, 2012, 2014, 2016 and 2017 CTP2. Sorted by: 1. It does exactly that if ON. 11,485 questionsHow to monitor the status of index defragmentation jobs. The syntax is: "java. Over time these indexes become fragmented so that ordered data retrieval becomes less efficient. 1. If an index is between 10% and 30% fragmented, I will REORGANIZE the index and UPDATE the statistics. No matter how many times I run the script to defrag these records, I still have the same indexes to be defraged and most of them with the same. Hi, The widely used thresholds are: Reorganize if fragmentation is between 10-30%. Product', PK_Product_ProductID); GO. dm_db_index_physical_stats function is the preferred tool to use to check index fragmentation on any CA or DA database table. Some people recommend not defragmenting tables under 1000 pages. DBREINDEX = rebuild a copy of the index (es) from scratch. Fragmentation will depend on the insert/update frequency on the indexed fields and the size of the Index page. Defragment on-demand and via schedules. Burt King. dm_db_index_physical_stats(DB_ID(), default, default, default, 'SAMPLED') AS. We have tried this but it does not work: Amend registry value. Make sure to thick the Enabled checkbox. Basically, do the minimum commensurate with your fragmentation levels. Review Deeper insight into unused indexes for SQL Server tip. Azure Automation: Automate Azure SQL Database indexes and statistics maintenance. Q2: Generally you do not need to run anything for reindex/update stats. index_id. avg_fragmentation_in_percent > 5 AND indexstats. I would highly recommend using a tool specific to sql server to defragment the drive(s) on which the files sit. SQL SERVER – 2005 – A Simple Way To Defragment All Indexes In A Database That Is Fragmented Above A Declared Threshold.